MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY
Volcanic mud flow debris. Solidified mud and volcanic ash filling the Gendol river gorge following a pyroclastic flow and subsequent lahars (volcanic mud flows) on the slopes of the Gunung Merapi (Mount Merapi) volcano. Gunung Merapi is one of Indonesia's most active volcanoes, located on the island of Java, 28 kilometres north of the city of Yogyakarta. A series of eruptions in October and November 2010, thought to be the largest since the 1870s, killed around 350 people and led to over 350,000 being evacuated from surrounding villages and towns. Photographed in March 2011, at Kaliadem, near Yogyakarta.
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